Motor for talking-machines.



J. K. STEWART, DEC'D.

1. B. STEWART. EXECUTIHX- MOTOR FOR TALKING MACHINES.

APPLICATION nueu AUGKIB, 191s.

Pz ltented Aug. 28, 1917.

4 a y a g w a m am W a 2 RJ j J 3 D, and at its outer uniTnn STATES r11OFFICE.

JOHN K. smwna'r, nncmsnn, BY JU IA NEW Ito-r03. r'on TnL'Kme-mAcnmns.

B. STEWART, EXECUTRIX, 0F NOBTHPOBT, YORK.

To all whom a may concerni; 1

Be it known that I, Junih B. STEWART, acitizen of the United States,residing at Northport, in the county" of Suffolk and State of New York,am the executrix of the lastwill and testament of JOHN K STEWART,deceased, who had invented new and useful Improvements in Motors forTalking-Machines, of which the following is a specification, referencebeing had to the accompanying drawings, forming a part thereof.

The purpose of this invention is to provide an improved spring motor foroperat-' ing a talking machine. It consists in the elements and featuresof construction shown and described, as indicated in the claims.

In the drawings r f Figure 1 is a side elevation of a portion of atalking machine comprising the support and the record-carrying table,and equipped with a motor embodying this invention.

Fig. 2 is a section .at the line, 2-2, on Fig. 1, being in the plane ofthe axis of the winding shaft. 1 v

Fig. 3 is a section at the line, 3-3, on Fig. 2.

Fig. 4 is a detail section axial with respect to one of the spacingposts of the frame.

Fig. 5 is -a; detail section taken at the plane indicated by the' line,5-5, adjacent to Fig. 2. 1

In the structure shown in the drawings, 1, is the support of the talkingmachine and its motor, 2, is the record-carrying tablet which is mountedupon the spindle or shaft, E, of the motor train. The motor comprisesthe top and bottom plates, A and B, in which are journaled the parallelshafts of the train extending from spring drum containing the powerspring, a, secured at its inner end to the coiling sha end to the drum,On the shaft, D, outside the drum there is pro vided a large spur gear,1)", which meshes with a pinion, T, on the shaft, T, of the train whichhas a gear T meshing with a pinion E on the shaft, E, which protrudesthrough the plate, A, and projects abovethe support, 1, to receive therecord-carrying tablet, 2. On the shaft, E, there is a large spur gear,E, having fine teeth for meshing plate to plate. C is the--Specification of Letters Patent. Patented 'Aug. 28, 1917.- A ucati nfiled August 1a, 1916. Serial No. 115,711.

operates for governing the speed in the well understood manner. Thebrake arm, G, is pivoted on the frame plate, A, and has at the oppositeend from the governor a cam slot, 9 which is engaged by a pin, 71., onthe end of a lever, H, 'fulcrumed on the frame and provided with a handpiece, H, which protrudesoutside the support or casing, 1, formanipulation to regulate' the speed.

The power-spring-coiling shaft, 1),, has fast upon it a spiral gear, 1),which meshes with a cooperating spiral gear fast on the winding shaft,J,which is journaled transversely to the power-spring-coiling shaft,having one journal bearing provided upon a lug, A rigid With the plate,A, and two half bearings, A and B opposed to each other, rigidrespectively with the plates, A and B. This construction permits the en-7-5 gagement of the winding shaft, J, in its bearing by the approach ofthe plates, A and B, on the journals of the parallel shafts of thetrain, and renders it possible to make the winding shaft, J, permanentlyrigid-- go and if desired, integralwith the worm gear, J thereon, andalso rigid, and if preferred integral, with a stop collar, J which ispositioned so asto stand between the two half bearing lugs so spacedfrom them as to permit "a limited longitudinalmovement of the windingshaftin itsbearing's. The spiral gear engagement between the windingshaft, J, and the power spring coiling shaft, D, operates to a largeextent as a lock against '90 theunwinding ofthe springby rotationof thecoiling shaft; but for desirably rapid winding, the pitch of the spiralgears is such that when the spring is fully wound, the gears might tendto transmit rotary movement from the powerv spring shaft tothe windingshaft in the reverse directiomof winding; as a further and finallgagaihsh the reverse action of the win .gshafit, avoiding pawl s ,t e Lfrom the inner end rotating the coiling shaft tends to tighten thecoil,'so that the coil operates as a friction clutch preventing thereverse or unwinding movement. This spring coil or clutch, K, is securedto the frame at the end of said spring coil away from which the otherend of the coil would be pulled by the thrust of the winding shaft whichwould tend to result from the reaction of the main spring transmittedthrough the spiral gears, D and J and, as above described the stopcollar, J on said shaft, J, is positioned between the bearings so as topermit a limited end thrust of the wind-.

ing shaft; and such end thrust, tending to tighten 'the spring coilclutch, K, on the winding shaft, insures'the clutching action of saidspring coil to'p'revent back rotation of the winding shaft; and sincethe pitch of the engaged spiral gears is such that the re action of thespring tends to produce the end thrust more readily than it tends toproduce rotation, of the gear on the winding shaft, this tightening ofthe coil-spring-clutch on the winding shaft is certain to occur beforeany-rotation of the winding shaft; and thus the grip of the clutch forpreventing the rotationiis insured.

To facilitate assembling, and at the same time to render the frame veryrigid against any distortion tending to carry the oppositejourfial-bearings of the parallel shafts outof alinen1ent,..the twoplates, A and B, a e each provided with four posts, M, projecting towardthe opposite plate, the meeting ends of the correspbnding posts beingmatched for tongue-and-groove engagement with each other as shown at, m,the diagonally opposite posts having the tongues parallel and at rightangles to the other two diagonally opposite posts, so thatdisengagementby horizontal movement in any direction is defeated; and these.posts are axially bored to receive the bolts, N, which fit within .theaxial bore and extend through the posts, thus holding them accurately inaline- The posts of one plate are interiorly ment. threaded fora part"of the length of the aperture for engagement of the threaded ends of thebolts for drawing, clamping and securing the opposed plates togetherwith their respective posts properly interlocked at their meeting ends.

A crank,'P, is provided for winding up 1118 motor spring, said crankbeing preferably detachably engageable with the winding shaft, J. suchdetachable engagement being effected most conveniently by aninteriorly-threaded axial bore, j in the end of the winding shaft, intowhich the end of the crank shaft is screwed; and to prevent theengagement effected in this manner be coming so tight in the windingprocess as to prevent the crank from being readily unscrewed from thewinding shaft, the thread at such engagement is preferably made verysteeply pitched so that the length of engagement effected by a singleturn is sufiicient for the length of a shoulder, 9 which is formed atthe end of the shaft extending radially thereto, said end being shapedspirally about the axis from the base to'the tip of said shoulder, thepitch of the'spiral being that of said thread and the crank has a crossp111, P which travels into engagement .with this shoulder in the lastturn of the unscrewing, the entire stress of the force applied forunscrewing it would have to be borne by the anchorage or stopping of theinner end of said spring coiled clutch with the frame, so thateventually that spring coiled clutch would be liable to be wrenched awayfrom the frame or broken. This is prevented by the expedient abovedescribed for preventing the crank from becoming screwed tight into theWinding shaft.

1. In combination with the opposed plates having shaft bearings forparallel shafts which extend from plate to plate, a-bearing on one ofsaid plates for a transversely-ex tending shaft, and lugs on therespective plates projecting toward each other, each having a halfbearing for such transverse shaft whereby thevtransver's dshaft may belodged and secured in said bearings by the approaching movement of saidplates on the journals of the parallel shafts.

2. In combination with the opposed plates having corresponding journalbearings for parallel shafts which extend from plate to plate; hollowposts projecting from the re-' spective plates toward each other, havingat their meeting endstongue-and-groove enga'gement with each other, theseveral posts having their respective tongues-and-grooves extending inhorizontal directions part of which are transverse to the other part.

3. In combination with the opposed plates having corresponding journalbearings for parallel shafts which extend from plate to plate; hollowposts projecting from the respective plates toward each other, having attheir meeting ends tongue-and-groove engagement with each other, saidposts comprising two pairs whose individuals alterinhorizontal-directions transverse to those of the other pair.

' 4:. In eombination With the opposed plates hai 'ing correspondingjournal bearings for parallel shafts which extend from plate to plate;hollow posts projecting from the respective plates toward each other,matched tor engagement between each other at their ends and boltsextending and fitting in the axial. cavities of said posts for aliningthem 10 of August, 1916.

JULIA B STEWART, Eweou-tfiw of J 07m K. Stewart, deceased.

